Keyboard apparatus

Abstract

A keyboard apparatus includes a plurality of keys each rotatable with a predetermined stroke, a support assembly which includes a support with one side rotatably arranged with a support rail and a jack with the one side rotatably supported by the support, and rotates with depression of any of the plurality of keys, a hammer unit which is operated by receiving an action of the jack, a shank rail which rotatably supports the hammer unit, and a jack stopper which makes contact with the jack which rotates with the depression of any of the plurality of keys, the jack stopper being placed on a rotation path of the jack and provided to a fixing portion which does not rotate with the depression any of the plurality of keys.

What is claimed is: 
     
       1. A keyboard apparatus, comprising:
 a plurality of keys each rotatable with a predetermined stroke; 
 a support assembly which includes a support with a first side rotatably arranged with a support rail and a jack with the first side rotatably supported by the support, and rotates with depression of any of the plurality of keys; 
 a hammer unit which is operated by an action of the jack; 
 a shank rail which rotatably supports the hammer unit; 
 a regulating portion which extends from the shank rail and makes contact with the support assembly; and 
 a jack stopper which makes contact with the jack which rotates with the depression of any of the plurality of keys, 
 wherein the jack stopper is placed on a rotation path of the jack and protrudes from the shank rail which does not rotate with the depression of any of the plurality of keys, and 
 wherein the shank rail, the regulating portion, and the jack stopper are arranged on a same side with respect to the jack. 
 
     
     
       2. The keyboard apparatus according to  claim 1 , wherein the jack stopper is shared by the plurality of keys. 
     
     
       3. The keyboard apparatus according to  claim 1 , wherein the jack stopper has a width in contact with the jack respectively arranged to the plurality of keys. 
     
     
       4. The keyboard apparatus according to  claim 3 , wherein the jack stopper has a width in contact with the jack respectively arranged to the plurality of keys for each octave units. 
     
     
       5. The keyboard apparatus according to  claim 1 , wherein the jack has, on a second side opposite to the first side, a rib projecting to a side of the hammer unit. 
     
     
       6. The keyboard apparatus according to  claim 5 , wherein the rib makes contact with the jack stopper when the jack is detached from the hammer unit by the depression of the key to rotate. 
     
     
       7. The keyboard apparatus according to  claim 1 , wherein the jack stopper has a contact surface which makes contact with the jack. 
     
     
       8. The keyboard apparatus according to  claim 7 , wherein the contact surface of the jack stopper is placed on the rotation path of the jack. 
     
     
       9. The keyboard apparatus according to  claim 7 , wherein the contact surface of the jack stopper includes a soft material.